The guy who designed this eraser is a genius! We all know that it’s more fun and effective to use the corners, but most simple rectangular erasers only have
four EIGHT at best, and even less once they’re used. Well, this plastic eraser, aptly named kadokeshi (corner eraser), has 28 edges! It’s distributed by classic stationary maker Kokuyo, and won a Good Design Award in 2003.
Product page (Japanese)